CN221126953U - Black start circuit and energy storage equipment - Google Patents
Black start circuit and energy storage equipment Download PDFInfo
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- CN221126953U CN221126953U CN202323081447.XU CN202323081447U CN221126953U CN 221126953 U CN221126953 U CN 221126953U CN 202323081447 U CN202323081447 U CN 202323081447U CN 221126953 U CN221126953 U CN 221126953U
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Abstract
The embodiment of the application provides a black start circuit and energy storage equipment, and relates to the technical field of the energy storage equipment, wherein the black start circuit comprises a first switch, a first switching power supply, a second switch and a second switching power supply; the first end of the first switch is connected with an external power grid, the second end of the first switch is connected with the alternating-current end of the first switch power supply, the direct-current end of the first switch is connected with the first end of the second switch, the second end of the second switch is connected with the first direct-current end of the second switch power supply, and the second direct-current end of the second switch power supply is connected with an external battery; the connecting node between the direct current end of the first switching power supply and the first end of the second switch is connected with a preset control circuit; the first switch is closed when the power supply of the external power grid is normal, and is opened when the power supply of the external power grid is abnormal; the second switch is opened when the power supply of the first switch power supply is normal, and is closed when the power supply of the first switch power supply is abnormal. The black start circuit provided by the embodiment of the application can prevent the feed of the energy storage battery.
Description
Technical Field
The application relates to the technical field of energy storage equipment, in particular to a black start circuit and energy storage equipment.
Background
The black start refers to that after the whole power system is shut down due to failure, a unit without self-starting capability is driven by a unit with self-starting capability, the recovery range of the power system is gradually enlarged, and finally the recovery of the whole power system is realized. The black start circuit is widely applied to various energy storage devices at present.
The existing black start circuit is usually powered from a commercial power and a battery respectively, and an output DC24V power supply is connected in parallel through an AC/DC switching power supply and a DC/DC switching power supply at the same time, so that the important control circuit can operate without power failure.
However, the AC/DC switching power supply and the DC/DC switching power supply are directly connected in parallel at the output side to cause a circulation problem, and in order to solve the problem, a diode is generally added to inhibit the circulation, but when the industrial and commercial energy storage system is normally used, the energy storage battery cannot be prevented from supplying power to the control circuit through the DC/DC switching power supply, so that the feeding phenomenon of the energy storage battery is caused.
Disclosure of utility model
The application provides a black start circuit and energy storage equipment, which can solve the technical problem that the black start circuit in the prior art is easy to feed an energy storage battery.
In a first aspect, an embodiment of the present application provides a black start circuit, where the black start circuit includes a first switch, a first switching power supply, a second switch, and a second switching power supply;
The first end of the first switch is connected with an external power grid, the second end of the first switch is connected with the alternating-current end of the first switch power supply, the direct-current end of the first switch power supply is connected with the first end of the second switch, the second end of the second switch is connected with the first direct-current end of the second switch power supply, and the second direct-current end of the second switch power supply is connected with an external battery;
the connecting node between the direct-current end of the first switching power supply and the first end of the second switch is connected with a preset control circuit;
The first switch is closed when the power supply of the external power grid is normal, and is opened when the power supply of the external power grid is abnormal;
the second switch is opened when the power supply of the first switch power supply is normal, and is closed when the power supply of the first switch power supply is abnormal.
In some embodiments, the black start circuit further comprises an ac breaker connected in series between the external power grid and the first end of the first switch.
In some embodiments, the black start circuit further comprises a fuse;
The fuse is connected in series between the external battery and the second direct current end of the second switching power supply.
In some embodiments, the black start circuit further comprises a first control switch and a second control switch;
The first control switch is connected in series between the alternating current breaker and a first end of the first switch;
the second control switch is connected in series between the fuse and a second direct current end of the second switching power supply.
In some embodiments, a connection node between the dc terminal of the first switching power supply and the first terminal of the second switch is used to output a dc voltage to the control circuit.
In some embodiments, the first switch is an ac contactor.
In some embodiments, the second switch is a relay.
In some embodiments, the first switching power supply is an AC/DC switching power supply.
In some embodiments, the second switching power supply is a DC/DC switching power supply.
In a second aspect, an embodiment of the present application provides an energy storage device, where the energy storage device includes a battery, a control circuit, and a black start circuit; the black start circuit is provided in the first aspect;
The battery is connected with a second direct-current end of a second switching power supply in the black start circuit;
The connection node between the direct current end of the first switch power supply and the first end of the second switch in the black start circuit is used for outputting direct current voltage to the control circuit.
According to the black start circuit and the energy storage device provided by the embodiment of the application, the electric linkage control of the first switch and the second switch is utilized, the loop switching of the mains supply and the battery supply can be automatically completed without using a software program, the effect of ensuring that an important control loop is not powered off is realized, and the feeding of an energy storage battery can be prevented.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
Fig. 1 is a schematic diagram of a black start circuit according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a black start circuit according to a second embodiment of the present application;
Fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.
The term "module" as used in embodiments of the present application refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and software code that is capable of performing the function associated with that element.
Some terms related to the embodiments of the present application are explained as follows:
BCU: and the battery cluster management unit is used for managing and controlling the equipment of the battery clusters. The system is mainly responsible for monitoring the state and performance of the battery cluster and carrying out charge and discharge control according to the requirement so as to ensure the safe and reliable operation of the battery cluster. The BCU monitors parameters such as voltage, temperature, current and the like of each single battery in the battery cluster to know the state of the battery in real time. It uses sensors to collect these data and sends them to a control unit for data processing and analysis. Based on these data, the BCU can determine the performance and status of the battery and take appropriate action to manage and control. In addition to monitoring and control functions, BCU has other advanced functions such as battery level management, battery balancing management, thermal management, and fault diagnosis. These functions may improve the efficiency and life of the battery cluster while ensuring safe and reliable operation thereof.
PCS: the energy storage converter is also called as a bidirectional energy storage inverter. The device is a core component for realizing bidirectional flow of electric energy between an energy storage system and a power grid, and is used for controlling the charging and discharging processes of a battery to perform alternating current-direct current conversion. The main functions of PCS include: and (3) performing constant power or constant current control according to the microgrid monitoring instruction to charge or discharge the battery, and simultaneously smoothing the output with strong fluctuation of wind photovoltaic and the like.
ESCU: the energy storage control unit is mainly responsible for controlling the charge and discharge process of the energy storage battery and realizing the storage and management of energy. ESCU monitors and manages the state of charge, the state of health and the like of the battery by collecting information such as voltage, current and temperature of the battery, and simultaneously controls the charge and discharge processes of the battery according to the collected information so as to ensure the safety and reliability of the battery. In addition, ESCU also has the communication function with a power grid or other energy systems, so that the energy dispatching and optimal management can be realized, and the energy utilization efficiency is improved.
The industrial and commercial energy storage equipment is energy storage equipment used in industrial or commercial terminals, and industrial and commercial users can not only utilize peak-to-valley electricity price difference to reduce operation cost, but also serve as a standby power supply to cope with sudden power failure accidents by configuring the industrial and commercial energy storage equipment. Existing industrial and commercial energy storage devices typically include battery clusters, high voltage tanks, BMS, PCS, power supply loops, control loops, and the like.
The black start refers to that after the whole power system is shut down due to failure, a unit without self-starting capability is driven by a unit with self-starting capability, the recovery range of the power system is gradually enlarged, and finally the recovery of the whole power system is realized. The black start circuit is widely applied to various energy storage devices at present.
The existing black start circuit is usually powered from a commercial power and a battery respectively, and an output DC24V power supply is connected in parallel through an AC/DC switching power supply and a DC/DC switching power supply at the same time, so that the important control circuit can operate without power failure.
However, the AC/DC switching power supply and the DC/DC switching power supply are directly connected in parallel at the output side to cause a circulation problem, and in order to solve the problem, a diode is generally added to inhibit the circulation, but when the industrial and commercial energy storage system is normally used, the energy storage battery cannot be prevented from supplying power to the control circuit through the DC/DC switching power supply, so that the feeding phenomenon of the energy storage battery is caused.
In view of the above technical problems, the embodiment of the application provides a black start circuit and energy storage equipment, which can automatically complete circuit switching of mains supply and battery power supply without using a software program by utilizing electric linkage control of a first switch and a second switch, realize the effect of ensuring that an important control circuit is not powered off, and prevent the power supply of an energy storage battery. Reference is made specifically to the following examples of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a black start circuit according to an embodiment of the present application. In some embodiments of the present application, the black start circuit includes a first switch K1, a first switch power source UR1, a second switch K2, and a second switch power source UR2.
The first end of the first switch K1 is connected with an external power grid, the second end of the first switch K1 is connected with an alternating-current end of the first switch power supply UR1, a direct-current end of the first switch power supply UR1 is connected with a first end of the second switch K2, a second end of the second switch K2 is connected with a first direct-current end of the second switch power supply UR2, and a second direct-current end of the second switch power supply UR2 is connected with an external battery; the connection node between the dc terminal of the first switching power supply UR1 and the first terminal of the second switch K2 is connected to a preset control circuit.
In some embodiments, the first switch K1 is closed when the external power grid is powered normally, and is opened when the external power grid is powered abnormally; the second switch K2 is opened when the power supply of the first switching power supply UR1 is normal, and is closed when the power supply of the first switching power supply UR1 is abnormal.
And when the output voltage of the external power grid is rated voltage (such as 220V) or is within a preset voltage range, the external power grid is powered normally, otherwise, the external power grid is powered abnormally.
Similarly, when the output voltage of the first switching power supply UR1 is the rated voltage (for example, DC 24V) or is within the preset voltage range, it indicates that the power supply of the first switching power supply UR1 is normal, otherwise, it indicates that the power supply of the first switching power supply UR1 is abnormal.
In some embodiments, a connection node between the dc terminal of the first switching power source UR1 and the first terminal of the second switch K2 is used to output a dc voltage to the control circuit.
Alternatively, the direct current voltage may be DC24V.
In the embodiment of the application, under the condition that an external power grid supplies power normally, the first switch K1 is closed, the first switch power supply UR1 outputs direct current voltage (such as output DC 24V), at the moment, the second switch K2 is opened, so that the output of the second switch power supply UR2 is opened, and the power supply for supplying power to the control circuit under the condition is the first switch power supply UR1. When the external power grid cannot supply power, the first switch K1 is turned off, the output of the first switch power source UR1 is turned off, the second switch K2 is turned on, the second switch power source UR2 outputs a direct current voltage (such as output DC 24V), and the power source for supplying power to the control circuit is the second switch power source UR2.
According to the black start circuit provided by the embodiment of the application, the electric linkage control of the first switch and the second switch is utilized, the loop switching of the mains supply and the battery power supply can be automatically completed without using a software program, the effect of ensuring that an important control loop is not powered off is realized, and the feeding of an energy storage battery can be prevented.
Based on the descriptions in the above embodiments, referring to fig. 2, fig. 2 is a schematic diagram of a black start circuit according to the second embodiment of the present application. In some embodiments of the present application, the black start circuit further includes an ac breaker QF connected in series between the external power grid and the first end of the first switch K1.
Among them, the ac circuit breaker QF is a switching device for turning on and off a circuit, and can be manually or automatically controlled. The device consists of a contact, a spring, an operating mechanism and the like, and the opening and closing of the contact can be controlled through the operating mechanism, so that the on-off of current is controlled. The circuit breaker has the functions of overload protection, short-circuit protection and the like, and can automatically break the circuit to protect electrical equipment in the circuit when overload or short-circuit and the like occur in the circuit.
In the embodiment of the application, the alternating current breaker QF can control the on-off of the commercial power 220V and provide overload protection and short-circuit protection.
In some embodiments of the present application, the black start circuit further includes a fuse, specifically including a fuse FU1 and a fuse FU2; the fuse FU1 is connected in series between the positive electrode of the external battery and one of the direct current ends of the second switching power supply UR 2; the fuse FU2 is connected in series between the negative electrode of the external battery and the other dc terminal of the second switching power supply UR 2.
The fuse is a device for protecting a circuit, and when the current in the circuit exceeds a rated value, the fuse is fused by overheat, thereby cutting off the current and protecting the electrical device in the circuit.
In some embodiments of the present application, the black start circuit further includes a first control switch SB1 and a second control switch SB1; wherein, the first control switch SB1 is connected in series between the positive terminal of the alternating current breaker QF and the first terminal of the first switch K1; the second control switch SB2 is connected in series between the fuse FU1 and the dc terminal of the second switching power source UR 2.
Alternatively, the first control switch SB1 and the second control switch SB1 may be manual control switches, which are manually turned on or turned off by a maintainer.
Optionally, the first switch K1 is an ac contactor.
Among them, an ac contactor is an electrical apparatus for remotely switching on and off a circuit, and is commonly used for controlling loads such as a motor. The device consists of a contact, a coil, an arc extinguishing device and the like, and can control the opening and closing of the contact by controlling the current of the coil, thereby controlling the on-off of the current.
Optionally, the second switch K2 is a relay.
The relay is an automatic control device, and the on-off of the circuit is controlled through the change of the induction current. In the black start circuit, the relay may function as follows:
The protection circuit: when the power system fails, the relay can cut off current rapidly, and the circuit and the equipment are protected from damage.
And (2) a control switch: the relay can control a switch in the circuit to realize the starting and stopping of the power system.
Detecting current: the relay can detect the magnitude and the change of the current, so as to judge whether the power system operates normally.
Realizing automatic control: the relay can be matched with other equipment to realize automatic control and adjustment of the power system.
Optionally, the first switching power supply UR1 is an AC/DC switching power supply.
Among them, an AC/DC switching power supply is a power converter that converts alternating current into direct current. The alternating current is converted into direct current through the rectifying and filtering circuit, and then the amplitude and the stability of the output voltage are adjusted through the switching circuit, so that stable direct current is provided for a load. The AC/DC switching power supply has various output types, such as single output, double output, multiple output and the like, and can select a proper output type according to actual needs to meet the requirements of loads.
Optionally, the second switching power supply UR2 is a DC/DC switching power supply.
The DC/DC switching power supply is a power converter that converts direct current into direct current. The switching circuit and the regulating circuit are used for converting the input direct current into the direct current with stable output so as to meet the requirements of loads. The DC/DC switching power supply has various output types, such as single output, double output, multiple output and the like, and can select a proper output type according to actual needs to meet the requirements of loads.
In the embodiment of the application, when SB1 and SB2 are closed, under the condition that an external power grid supplies power normally, a normally open point is closed after a coil of a first switch K1 is electrified (220V), and an AC/DC switching power supply outputs DC24V; the normally closed point is opened after the coil of the second switch K2 is powered (24V), so that the output of the DC/DC switching power supply is disconnected, and the DC24V power supply for supplying power to the control circuit is provided by the AC/DC switching power supply. When the external power grid cannot supply power, the coil of the first switch K1 is powered off, the output of the AC/DC switch power supply is disconnected, the coil of the second switch K2 is powered off, the normally closed point is closed, the DC/DC switch power supply outputs DC24V, and the DC24V power supply for supplying power to the control loop is provided by the DC/DC switch power supply under the condition.
Based on the descriptions in the above embodiments, in some embodiments of the present application, there is further provided an energy storage device, which includes a battery, a control circuit, and the above black start circuit.
The battery is connected with a second direct-current end of a second switching power supply in the black start circuit; the connection node between the dc end of the first switching power supply and the first end of the second switch in the black start circuit is used for outputting a dc voltage to the control circuit.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the present application. In some embodiments of the present application, the energy storage device includes: battery cluster 301, PCS302, first circuit breaker QF1, and auxiliary power supply loop 303. The auxiliary power supply circuit 303 includes a black start circuit 3031.
In some embodiments, PCS402 includes a direct current filter circuit EMI, a first contactor KM1, a second contactor KM2, a pre-charge resistor R, a fuse FU, and an AC/DC inverter circuit. Wherein:
The direct current filter circuit EMI is connected in parallel between the positive electrode interface and the negative electrode interface of the battery cluster 401; the EMI can be used for a circuit for filtering useless signals in a power circuit, so that the interference of the signals can be reduced, and the stable output of the power is ensured.
The first end of the first contactor KM1 and the first end of the second contactor KM2 are connected with the positive electrode interface, the second end of the first contactor KM1 is connected with the first direct current end of the AC/DC inverter circuit, and the pre-charging resistor R is connected between the second end of the second contactor KM2 and the first direct current end in series; the fuse FU is connected in series between the negative electrode interface and a second direct current end of the AC/DC inverter circuit; the alternating current end of the AC/DC inverter circuit is connected with the first end of the first breaker QF1, and the second end of the first breaker QF1 is connected with an external power grid.
Among them, a pre-charge resistor is a resistor for limiting a current, and is generally used in a circuit to prevent an excessive current from burning out an electrical device. When the contactor is on, the pre-charge resistor may limit the instantaneous value of the current, thereby protecting the electrical equipment in the circuit.
In some embodiments, the black start circuit 3031 includes a first fuse FU1, a second fuse FU2, a DC/DC switching power supply, a relay KA, an AC/DC switching power supply, and a third contactor KM; wherein:
The first fuse FU1 is connected in series between the positive electrode interface and the first input end of the DC/DC switching power supply, and the second fuse FU2 is connected in series between the negative electrode interface and the second input end of the DC/DC switching power supply; the first end of relay KA connects the output of DC/DC switching power supply, and the second end of relay KA connects the direct current end of AC/DC switching power supply, and the alternating current end of AC/DC switching power supply connects the first end of third contactor KM, and the first end of second circuit breaker QF2 is connected to the second end of third contactor KM, and the first end of first circuit breaker QF1 is connected to the second end of second circuit breaker QF 2.
In some embodiments, the second terminal of the relay KA is provided with a power supply circuit for supplying power to the BCU.
In the embodiment of the application, under the condition that an external power grid supplies power normally, a normally open point is closed after the KM coil is electrified, and an AC/DC switching power supply outputs DC24V; the normally closed point is disconnected after the KA coil is powered, so that the output of the DC/DC switching power supply is disconnected, and the DC24V power supply for supplying power to the control loop is provided by the AC/DC switching power supply. Under the condition that an external power grid cannot supply power, the KM coil is powered off, the output of the AC/DC switching power supply is disconnected, the KA coil is powered off, the normally closed point is closed, the DC/DC switching power supply outputs DC24V, and the DC24V power supply for supplying power to the control loop under the condition is provided by the DC/DC switching power supply.
Based on the descriptions in the above embodiments, in some embodiments of the present application, the energy storage device further includes an air cooling component; the air cooling assembly includes an HVAC module and a fan located in a battery cluster.
One end of the fan is connected to an AC/DC switching power supply, the other end of the AC/DC switching power supply is connected to one end of a breaker QF3, and the other end of the breaker QF3 is connected to the first end of the QF 1.
The HVAC module is connected to one end of the breaker QF4, and the other end of the breaker QF4 is connected to the first end of the QF 1.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.
In fig. 4, the primary energy storage device includes a liquid cooled assembly. Wherein, this liquid cooling subassembly is connected in the one end of circuit breaker QF4, and the first end of QF1 is connected to the other end of circuit breaker QF 4.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in the embodiments of the present application may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A black start circuit, which is characterized by comprising a first switch, a first switch power supply, a second switch and a second switch power supply;
The first end of the first switch is connected with an external power grid, the second end of the first switch is connected with the alternating-current end of the first switch power supply, the direct-current end of the first switch power supply is connected with the first end of the second switch, the second end of the second switch is connected with the first direct-current end of the second switch power supply, and the second direct-current end of the second switch power supply is connected with an external battery;
the connecting node between the direct-current end of the first switching power supply and the first end of the second switch is connected with a preset control circuit;
The first switch is closed when the power supply of the external power grid is normal, and is opened when the power supply of the external power grid is abnormal;
the second switch is opened when the power supply of the first switch power supply is normal, and is closed when the power supply of the first switch power supply is abnormal.
2. The black start circuit of claim 1, further comprising an ac breaker connected in series between the external power grid and the first end of the first switch.
3. The black start circuit of claim 2, further comprising a fuse;
The fuse is connected in series between the external battery and the second direct current end of the second switching power supply.
4. The black start circuit of claim 3, further comprising a first control switch and a second control switch;
The first control switch is connected in series between the alternating current breaker and a first end of the first switch;
the second control switch is connected in series between the fuse and a second direct current end of the second switching power supply.
5. The black start circuit of claim 1, wherein a connection node between the dc terminal of the first switching power supply and the first terminal of the second switch is configured to output a dc voltage to the control circuit.
6. The black start circuit of any one of claims 1 to 5, wherein the first switch is an ac contactor.
7. The black start circuit of any one of claims 1 to 5, wherein the second switch is a relay.
8. The black start circuit of any one of claims 1 to 5, wherein the first switching power supply is an AC/DC switching power supply.
9. The black start circuit of any one of claims 1 to 5, wherein the second switching power supply is a DC/DC switching power supply.
10. An energy storage device, wherein the energy storage device comprises a battery, a control circuit and a black start circuit; the black start circuit is the black start circuit according to any one of claims 1 to 9;
The battery is connected with a second direct-current end of a second switching power supply in the black start circuit;
The connection node between the direct current end of the first switch power supply and the first end of the second switch in the black start circuit is used for outputting direct current voltage to the control circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323081447.XU CN221126953U (en) | 2023-11-15 | 2023-11-15 | Black start circuit and energy storage equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202323081447.XU CN221126953U (en) | 2023-11-15 | 2023-11-15 | Black start circuit and energy storage equipment |
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